Diestock



R. E. HYDE March 10, 1931.

DIESTOCK Filed Feb. 18, 1928 2 Sheets-Sheet 1 V INVENTOR.

ph E/Hyde 1 I ATTORNEYfi March 10, 1931. R E Y 1,795,604

UIESTOCK Filed Feb. 18, 1928 2 Sheets-Sheet 2 lllllllrrlr 5 INVENTOR.

Fad 0h Hyde A TTO NEYvS Patented Mar. 10, 1931 UNITED STATES PATENT RALPH E. HYDE, OF CLEVELAND, OE-IIG, ASSIGNOR TD TP'E OSTER MANUFACTURING 7 COMPANY, OF CLEVELAND, OHIO, A. CORPQR-A'IION OF OHIO DIESTOCK Application filed February 18, 1928. Serial No. 255,287.

The present invention relates, as indicated, toa .diestock, and more particularly to a die stock of the general type disclosed in the patentto Oster No. 1,044,808. It is an object of the present invention to provide a die stock of the character described having various improved features making for increased accuracy, safety and efficiency in the use thereof. Further objects of the invention will appear as the description proceeds. To

the accomplishment of the foregoing and re lated ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail certain mechanism, embodying theinvention, such disclosed means constituting, however, but one of variious mechanical forms in which the principle of the invention may be used.'

In said annexed'drawing:

Fig; 1:is a front elevation of a stock of the type contemplated by the present invention; Fig. 2 is a bottom plan view thereof; Fig. 3 is a transverse section taken substantially on the line 33 of Fig. 1; Fig. 4C is a rear elevation of said die stock; and Figs. 5 and 6.

ings, the reference. numeral 1 indicates the.

back plate of a die stock, while the numeral 2 indicates the front plate thereof. back plate is formed with a bore 3 bounded by a rearwardly extending annular flange 1, and said front plate is formed with a corre sponding aperture 5. The dies 6 extend into side bore 5. The bore 5 isslightly enlarged adjacent'its outerend as at 7 and an annular groove 8 of considerably greater depth circumscribes said bore, forming an outstanding flange 9 between said enlarged bore and said groove 8. A second narrower flange 10 forms the outer surface of said front plate 2. V Journall'ed upon said flange 9, resting upon said flange 10, and provided with cam elements 11 extending into said groove 8 and engaging said dies 6, there is a cam plate 11, the bore 12 of. which snugly fits the external diameter of said flange 9. Said bore 12 is Said slightly enlarged adjacent-its outer end as at 13. A cam plate washerl l is provided with an externally threaded cylindrical flange for engagement with the threads in the portion 7 of the bore 5, and with an annular flange 16 overlying the outer end of the flange 9 and entering the enlarged portion, 13 of the bore 12 of the cam plate 11. The bore 15 ofsaid cam plate washer 14 has a diameter corresponding to that of the bore 5. The cam plate washer 1 1 is locked in place by means of a pin 17 extending through an aperture in the flange 16 thereof and into an aperture in the flange 9.

Said cam plate 11 is provided with a laterally extending ear 18 formed with an arcuate groove 19 in which there is mounted a pin 20. Said pin is adjustable longitudinally of said slot 19, and is adapted to be clamped in adjusted position by means of clamping plates 21 and 22 abutting against opposite faces of said ear 18, said plate 22 being provided with a handle 23 for convenience of operation. Mounted upon a depending projection 24: on the front plate 2 are a pair of bearings 25 adapted to form-journals for a pivot pin 26 upon which is mounted an operating member 2? having a handle 28 pro jecting therefrom. A cam groove 29 is formed in the external surface of said operating member 27, and the innerend 30. of said pin 20 is entered in saidgroove 29. Substantially hemispherical depressions 31- and are formed in the opposite ends of said groove and the portion 52 of said groove in which is formedthe depression 31 has its axis disposed in a plane normal to the axis of said member 27 for a purpose to be explained.

The inner end of=saidpin 20 is provided with an axially extending recess 33 in which is mounted a round ended latch member 34 which is urged outwardly'by a-compression spring 35 enclosed within said recess 33.

The back plate 1 and front plate 2 of the die stock are integrally connected by a pair of diametrically opposed relatively narrow webs 36 defining between them relatively large openings 37 through which access maybe had to work held in said die stock. A plurality (preferably three) of work centering jaws 38 are reciprocably mounted in guide-ways 39 in said back plate 1 aid jaws extending into the bore 3 there and being formed with teeth d for cooperation with the threads ll of a scroll plate 42. Said scroll plate is journallcd on the flange 4E and is provided with a handle as for convenience of operation. A relatively wide circumferential groove 4% is formed in said flange 4-. adjacent the outer end thereof, and a washer backs said scroll plate a2, said washer slightly overhanging said groove ll as indicated at =13 in Fig. 6. A split spring ring 4-? having one end thereof bent to enter an aperture 529 adjacent the periphery of said washer d5 retains said washer and said scroll plate l2 in position. is is clearly shown in Figs. 5 and 6, saio ring l? is formed of stock having a cross-sectional diameter slightly less than that of the groove ll. It will be seen that the described arrangement and construction of parts causes the ring l7 to exert a pressure toward the left as viewed in Figs. 3, 5, and 6 upon the washer and the scroll plate Such pressure is the resultant of the contractile tendency the ring 4t? operating against the concave side wall of the groove 44-, the washer ll) being of such thickness as to prevent the ring from reaching the bottom of the groove l4.

Sockets 50 are formed on or secured to the webs 36, said sockets being adapted to receive handle members 51 for rotating said stock.

llhile the operation of the device is believed to be clear from the above description, a brief summary thereof may be given here. Initially, the handle 23 is rotated in a counterclockwise direction to release the clamping engagement of the plates 21, 22, upon the car 18 and permit the adjustment of the cam plate 11. The handle 28 is then rotated in a clockwise direction as viewed in Fig. 3 to position the end of the pin 20 in the portion 52 of the slot 29. Thereafter, the cam plate 11 is rotated to set the chasers to the proper size for cutting upon the piece of work in question, and then the handle 23 is retated in clockwise direction to lock the cam plate in adjusted position with respect to the pin 20. The cam plate 11 and the cam plate washer Ll will, as usual, have indicia thereon to facilitate such setting.

Thereupon a piece of WOIi to be threaded is inserted through the bores, 3, 5, and 15, and the operator grasps the handle 43 to rotate the scroll plate 42. Rotation of said plate causes the teeth of the jaws 38 to follow the spiral 41 of the scroll plate, whereby said jaws 38 are uniformly set up toward the center of the bore 3 to center the work in said bore. The operator then grasps the handles 51 and rotates the whole stock with respect to the work to cut the desired thread.

In order, now, to remove the stock from the work without backing it oil along the thread just cut, the operator grasps the handle 28 and rotates the operating member 27 in a counterclockwise direction to the position shown in Fig. 3. Such rotation causes the pin 20 to follow the cam groove 29 toward the left as viewed in Fig. 2, and, since the pin is rigidly clamped to the ear 18, such movement of the pin causes rotation of the cam plate 11 in a clockwise direction as viewed in Fig. 1. Such rotation is sufficient to re lease the engagement of the dies 6 with the work and to permit the removal of the stock without backing the same oii' along the thread.

it will be quite apparent that the length of the slot 19 determines the range of adjustment through which the cam plate may be rotated in working upon different sizes of pipe or bar stock. \Vhen the handle 28 is in the position illustrated in Fig. 3, the latch member 3% lies in the depression 32 to prevent accidental movement of the operating member 28, and similarly when the latter has been moved to its opposite extreme position, the latch member 34: will lie in the depression 31 for the same purpose. Fru'thermore, the pin lies within the circun'lferential portion 52 of the groove 29, and cannot be jarred toward the left as seen in Fig. 2 because of its bearing on the side walls of said portion 52. It will be apparent that, once the pin 20 has been positioned for a particular size of work, all necessary movement of the cam plate will be effected by operation of the member 27 and without the necessity of varying the adjustment of the pin 20 in the slot 19.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

I therefore particularly point out and dis tinctly claim as my invention:

1. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die-stock and having a lateral car formed with an arcuate slot tierethrough, a pin extending through said slot, means to secure said pin in any adjusted position in saic. slot, an operating member on said stock, said operating member being formed with acam groove, and said pin extending into said can: groove, and cooperating means carried by said pin {UK said member for preventing accidental shifting of the latter. Q

2. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die-stock and lnwing lateral car formed with an arcuate slot therethrough, a pin e1:- tending through said slot, means to secure said pin in any adjusted position in said slot, an operating member on said stock, said operating member being formed with a cam groove, and said pin extending into said cam groove, said groove being formed with a recess adjacent each end thereof, said pin being provided with a recess in that end which enters said groove, a latch member in said pin recess and adapted to enter selectively said slot recesses, and a spring within said in recess urging said latch member outwarc ly.

3. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die stock, a cam rotatably mounted on said die stock on an axis parallel to the plane of said cam plate, and a pin carried by said plate and cooperably engaging said cam.

4. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die stock, a cam rotatably mounted on an axis parallel to the plane of said cam plate, and a pin releasably secured to said cam plate and projecting therefrom in a direction normal to the plane of said cam plat-e, the free end of said pin cooperatively engaging said cam.

5. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die-stock and having a lateral ear formed with an arcuate slot therethrough, a pinextending through said slot rele-a-sably engaging said plate, means on said stock adjacent said cam plate ear providing bearings for a pivot, a pivot mounted in said bearings in parallelism with the plane of said cam plate, and a cylindrical operating member axially ournalled on said pivot and provided in its cylindrical surface with a cam groove, said pin extending into said groove.

6. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die-stock and having a lateral ear formed with an arcuate slot therethrough, a pin extending through said slot releasably engaging said plate, means on said stock adjacent said cam plate ear providing bearings for a pivot, a pivot mounted in said bearings in parallelism with the plane of said cam plate, a cylindrical operating member axially journalled on said pivot and provided in its cylindrical surface with a cam groove, said pin extending into said groove, and cooperating means car ried by said pin and said operating member for preventing accidental shifting of the latter.

7. The combination with a die-stock carrying cutters, of a cam plate for advancing and retracting said cutters rotatably mounted on said die-stock and having a lateral ear formed with an arcuate slot therethrough, a pin extending through said slot releasably engaging RALPH E. HYDE. 

